Seismicity and Seismic Risk in the Offshore North Sea Area

1. Front Matter

   Pages i-xxv

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2. Geology and Tectonics

   1. Front Matter

      Pages 1-1

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   2. Tectonics of the North Sea Basin and their Possible Relation to Historical Earthquakes

      • Peter A. Ziegler

      Pages 3-13

   3. North Sea Seismotectonics and the Role of Geology in Offshore Seismic Risk Assessment

      • Colin A. Davenport

      Pages 15-30

   4. Constraints on Seismo-Tectonic Models for the North Sea

      • Alan D. Gibbs

      Pages 31-34

   5. What Happens to the Rhine Graben ‘Sub-Plate Boundary’ Where it Meets the S. North Sea?

      • Robert Muir Wood

      Pages 35-42

   6. Geology and Tectonics. Panel Discussion. Introductory Remarks.

      • H. A. van Adrichem Boogaert

      Pages 43-45

   7. Possible Neotectonic Fault Movements in Norway

      • P. B. Selnes

      Pages 47-48

3. Back Matter

   Pages 49-50

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4. Seismicity

   1. Front Matter

      Pages 51-51

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   2. Seismicity of the North Sea Area

      • Frode Ringdal

      Pages 53-75

   3. Some Problems Concerning the Seismicity of the North Sea Area

      • J.-M. Van Gils

      Pages 77-88

   4. Non-Random Distribution of Earthquakes in the North Sea Basin Area

      • A. Reinier Ritsema

      Pages 89-99

   5. Seismicity and Neotectonic Structural Activity of the Rhine Graben System in Central Europe

      • L. Ahorner

      Pages 101-111

   6. Removal of Ghosts

      • Jørgen Hjelme

      Pages 113-114

   7. Commentaires sur une Carte seismique de la Mer du nord et de la Mer de Norvege

      • E. Peterschmitt

      Pages 115-120

5. Back Matter

   Pages 121-123

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6. Tides, Ocean Waves and Sea Level Changes

   1. Front Matter

      Pages 125-125

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   2. Tidal Research and Seismicity

      • Paul Melchior

      Pages 127-130

   3. Changes of Relative Mean Sea-Level and of Mean Tidal Amplitude Along the Dutch Coast

      • J. G. de Ronde

      Pages 131-141

The Workshop on the Seismicity and Seismic Risk in the Off­ shore North Sea Area was intended to bring together experts from a variety of disciplines as well as interest groups with involve­ ment in siting, design and construction of offshore structures in the region. Participants came from the fields of geology, seismology, oceanography, geotechnical and structural engineering and risk analysis. The wide range of participant affiliations included institutes, Observatories, universities, oil companies, consultants and insurance firms. All nationalities around the North Sea were present, in addition to some experts from outside the region. All participants were present on the basis of personal invitation. The idea of organizing the Workshop stemmed from conside- tions, such as: the rapidly increasing material and personel investments and versatility of type of structures in the basin.during the past decade; - the present-day important role Jf the North Sea oil and gas production in the economy of Western Europe; and - the increase of potential environmental risks in the region. Although devastating earthquakes are almost unknown in the area and seismic hazard is not great, the seismic risk grows with the growing size and number of structures in the area. The study of the potential seismic risks, therefore, cannot be neglected any more. The siting and design of offshore platforms and submarine pipelines are controlled by the degree of their vulnerability as well as the seismic hazard. in the region.

• earthquake
• geotechnical engineering
• seismic
• seismology

• Royal Netherlands Meteorological Institute (KNMI), De Bilt, The Netherlands

  A. Reinier Ritsema

• Specialized Engineering Consulting Services (SPECS), Brussels, Belgium

  Aybars Gürpinar

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